EP0583824B1 - Dispositif de bobines en quadrature pour l'examen mammographique à résonance magnétique - Google Patents

Dispositif de bobines en quadrature pour l'examen mammographique à résonance magnétique Download PDF

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Publication number
EP0583824B1
EP0583824B1 EP93202361A EP93202361A EP0583824B1 EP 0583824 B1 EP0583824 B1 EP 0583824B1 EP 93202361 A EP93202361 A EP 93202361A EP 93202361 A EP93202361 A EP 93202361A EP 0583824 B1 EP0583824 B1 EP 0583824B1
Authority
EP
European Patent Office
Prior art keywords
coil
coil system
coil arrangement
magnetic resonance
arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93202361A
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German (de)
English (en)
Other versions
EP0583824A3 (en
EP0583824A2 (fr
Inventor
Günther Christoph Leussler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Patentverwaltung GmbH, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0583824A2 publication Critical patent/EP0583824A2/fr
Publication of EP0583824A3 publication Critical patent/EP0583824A3/de
Application granted granted Critical
Publication of EP0583824B1 publication Critical patent/EP0583824B1/fr
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
    • G01R33/3678—Electrical details, e.g. matching or coupling of the coil to the receiver involving quadrature drive or detection, e.g. a circularly polarized RF magnetic field
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
    • G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils

Definitions

  • the invention relates to a coil arrangement for MR examinations of the breast.
  • a coil arrangement for MR examinations of the breast.
  • Such a coil arrangement is in progress from the article "Prototype double coil for breast MR measurement” by Kaiser et al. Röntgenstr. 151.1 (1989), pages 103-105.
  • This coil arrangement comprises two conductor loops in parallel planes, which can be connected to a receiver arrangement of an MRI device.
  • This coil arrangement serves for the simultaneous examination of both breasts and has a worse signal-to-noise ratio than a single coil designed for the examination of a single breast.
  • the object of the invention is to improve the signal-to-noise ratio. This object is achieved in a coil arrangement for MR examinations of the breast with a first coil arrangement which, on the lateral surface of a cylinder, comprises several conductor loops which are only inductively coupled to one another in planes parallel to one another, one of which can be connected to an input of a receiver arrangement and with one as Surface coil of the butterfly type designed second coil arrangement, which is located on one of the end faces of the first coil arrangement and can be connected to a further input of the receiver arrangement.
  • the first and the second coil arrangement are used together for the breast examination.
  • the first coil arrangement is described in detail in DE-OS 38 16 831.
  • the second coil arrangement is a surface-type coil of the butterfly type, which is described in EP-OS 338 624. Both publications are expressly referred to.
  • the first coil arrangement can detect high-frequency magnetic fields with a field direction parallel to the cylinder axis, while the second coil arrangement, which lies in a plane parallel to the planes of the conductor loops of the first coil arrangement, high-frequency magnetic fields can detect that run perpendicular to the cylinder axis.
  • Both high-frequency coil arrangements therefore act together as a quadrature coil arrangement with a particularly favorable signal-to-noise ratio.
  • a further development of the invention provides that the opening between the outer conductors of the second coil arrangement is larger than the opening enclosed by the individual conductor loops of the first coil arrangement.
  • the dashed block 3 contains a main field magnet, which generates a strong, homogeneous, horizontally extending magnetic field.
  • a high-frequency transmission coil is provided therein, which generates a high-frequency magnetic field perpendicular to the stationary magnetic field in the examination area with a frequency that is linearly dependent on the strength of the stationary magnetic field.
  • the radio frequency transmission coil is operated on a pulse basis.
  • block 3 also includes gradient coils, which can generate magnetic gradient fields with gradients effective in different directions during or after the high-frequency pulses.
  • FIG. 2 shows a coil arrangement suitable for breast examinations.
  • This coil arrangement comprises a first coil arrangement which contains conductor loops 11 on a cylindrical carrier body 10 in several parallel planes, which are only inductively coupled to one another and one of which can be connected to the input of a receiver arrangement.
  • Such high-frequency coil arrangements are known from DE-OS 38 16 831, to which express reference is made.
  • the carrier body has a cylindrical shape, i.e. its cross-sections in different cross-sectional planes perpendicular to the cylinder axis are identical.
  • the dimensions of the hollow cylindrical support body which consists of a non-conductive material, preferably of plastic, are adapted to the anatomy of the patient to be examined, so that during an examination the inside of the support body can accommodate both breasts at the same time.
  • the support body can have a height of e.g. 6 cm, the walls of which are flat in the central part of the support body and a distance of e.g. Have 16 cm.
  • the flat walls in the central area are connected to one another on both sides via edge parts with an arcuate cross section, so that dimensions of 33 cm result in the longitudinal direction (i.e. in the horizontal direction in FIG. 2).
  • a surface coil designed as a surface coil second coil arrangement that can detect high-frequency magnetic fields that run perpendicular to the cylinder axis.
  • This surface coil can be applied to a carrier plate, not shown.
  • the surface coil is of the so-called butterfly type. Such coils are known from EP-OS 338 624 and the publication mentioned therein. This is expressly referred to.
  • the surface coil has two parallel and closely spaced center conductors 12, which open into two mirror-image identical loop parts, which together form a loop whose shape corresponds to one of the conductor loops 11, but expediently has larger dimensions.
  • the loop part ends in the center conductor of the other loop part and this other loop part ends in a further terminal of the coil.
  • the current through the two central conductors has the same direction, which is opposite to the direction of the current through the outer conductors 13. This coil can thereby detect high-frequency fields that run perpendicular to the axis of the cylinder 10 and perpendicular to the central conductors 12.
  • the entire coil arrangement 10 ... 13 must be inserted into the magnetic resonance scanner so that the two magnetic field directions, which are different from the first and the second coil arrangement can be detected, are perpendicular to the direction of the homogeneous stationary magnetic field, that is, the homogeneous stationary magnetic field must run parallel to the center conductors 12 during the examination - as indicated by the arrow 14.
  • the coil arrangement 10 .... 13 must therefore be placed accordingly in the MRI device. This could be done manually by the user for each examination. It is more favorable if at least one of the two coil arrangements is brought into a defined position by a fixed connection to the device or a part that can be inserted therein.
  • Fig. 3 shows a section of a flat pillow 16, which can be placed on the patient bed 1 during a breast examination and on the the patient lies down during a breast examination.
  • the coil arrangement acc. Fig. 2 is embedded in this pillow, with 15 is the plate which carries the surface coil 12, 13.
  • the surface coil 13 (with a suitable switch-off option) can be arranged on the table top surface of the couch 1 facing the patient.
  • the coil arrangement 10, 11 must then be placed on and aligned with it during a breast examination.
  • the coil arrangements 11-12, 13 act as a quadrature coil.
  • Fig. 4 shows - purely schematically - a circuit for processing the signals supplied by the two coil arrangements.
  • the essential component is a quadrature combiner 20 with a first input 21 and a second input 22.
  • the signal at the output 23 of the combiner corresponds to the product of the signal at the input 21 and the signal rotated through 90 ° at the input 22 Surface coil 12, 13 connected and at the input 22 the coil arrangement with the conductor loops 11.
  • the optimal effect of a quadrature coil arrangement results only for the spatial areas in which the decay of the nuclear magnetization in both coils adds the same size signals.
  • the distance of this area from the plane of the surface coil 12 , 13 depends on their dimensions in relation to the dimensions of the coil arrangement 11.
  • FIG. 2 unfolds its advantages only if the homogeneous stationary magnetic field in the magnetic resonance examination device runs in the longitudinal direction of the table. If it runs in the horizontal direction but perpendicular to the longitudinal direction of the table, essentially only the first coil arrangement (11) is effective, while the coil 11 is ineffective when the field is vertical.
  • Fig. 5 shows a plan view of the coil arrangement, wherein it can be seen that it consists of two identical and independent parts.
  • Each part per se only permits the examination of a single breast and comprises a coil arrangement 11a or 11b which, according to the arrangement 11 in FIG a - similar to the arrangement according to FIG. 2 - in its shape and in its dimensions adapted surface coil 12a, 13a or 12b, 13b in a plane parallel to the above-mentioned planes.
  • this coil arrangement acts optimally when the homogeneous stationary magnetic field runs in the direction of the arrow 17, ie perpendicular to the plane of the drawing in FIG. 1.
  • these coil arrangements can also be used in magnetic resonance examination devices in which the homogeneous stationary magnetic field runs in the longitudinal direction of the table. To do this, the two coil arrangements only have to be rotated by 90 ° each.
  • the advantage over the coil arrangement according to FIG. 2 is an improved signal-to-noise ratio.
  • the disadvantage is that for each of the two coil arrangements 11a Vietnamese wires or 11b Vietnamese wires, a circuit according to FIG. 4 and the analog or digital processing part connected downstream of it are required. This disadvantage could be avoided if the breasts were examined in succession with only one of the coil arrangements shown in FIG. 5. However, this would extend the examination time and, in addition, examinations with contrast agents in which the time course of the contrast agent enrichment is to be registered would be practically impossible.

Claims (3)

  1. Dispositif de bobines en quadrature pour l'examen mammographique par résonance magnétique avec un premier dispositif de bobines, qui comprend, sur la surface enveloppe d'un cylindre, dans des plans parallèles entre eux, plusieurs boucles de conducteur couplées les unes aux autres simplement par induction, dont une peut être connectée à une entrée d'un dispositif récepteur et avec un deuxième dispositif de bobines réalisé sous la forme d'une bobine de surface de type papillon qui se trouve à l'une des faces d'about du premier dispositif de bobines et peut être connectée à une autre entrée du dispositif récepteur.
  2. Dispositif de bobines en quadrature suivant la revendication 1, caractérisé en ce que l'ouverture entre les conducteurs extérieurs du deuxième dispositif de bobines est plus grande que l'ouverture délimitée par les diverses boucles de conducteur du premier dispositif de bobines.
  3. Appareil d'examen à spin nucléaire avec une table d'examen pour recevoir une personne à examiner et avec un dispositif de bobines en quadrature suivant la revendication 1 ou 2, caractérisé en ce que la table d'examen est pourvue d'une ouverture pour recevoir le premier dispositif de bobines, ou un coussin à disposer sur la table d'examen est prévu, dans lequel les deux dispositifs de bobines sont intégrés, qu'il subsiste une ouverture libre dans le domaine délimité par le premier dispositif de bobines et que le deuxième dispositif de bobines se trouve dans le domaine de la face d'about inférieure du premier dispositif de bobines.
EP93202361A 1992-08-13 1993-08-11 Dispositif de bobines en quadrature pour l'examen mammographique à résonance magnétique Expired - Lifetime EP0583824B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4226814 1992-08-13
DE4226814A DE4226814A1 (de) 1992-08-13 1992-08-13 Spulenanordnung für MR-Untersuchungen der Mamma

Publications (3)

Publication Number Publication Date
EP0583824A2 EP0583824A2 (fr) 1994-02-23
EP0583824A3 EP0583824A3 (en) 1994-06-01
EP0583824B1 true EP0583824B1 (fr) 1997-11-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93202361A Expired - Lifetime EP0583824B1 (fr) 1992-08-13 1993-08-11 Dispositif de bobines en quadrature pour l'examen mammographique à résonance magnétique

Country Status (4)

Country Link
US (1) US5416413A (fr)
EP (1) EP0583824B1 (fr)
JP (1) JP3464024B2 (fr)
DE (2) DE4226814A1 (fr)

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US5490513A (en) * 1992-09-28 1996-02-13 Fonar Corporation Multiple patient breast scanning on a magnetic resonance imaging apparatus
US5575287A (en) * 1993-01-25 1996-11-19 Fonar Corporation Inductively coupled RF coils for magnetic resonance studies
US5804969A (en) * 1995-07-28 1998-09-08 Advanced Mammography Systems, Inc. MRI RF coil
DE19528260A1 (de) * 1995-08-01 1997-02-06 Siemens Ag Mammographie-Antenne für Magnetresonanzuntersuchungen
EP0920279B1 (fr) * 1996-07-12 2004-09-29 Koninklijke Philips Electronics N.V. Appareil d'examen par resonance magnetique
US6023166A (en) * 1997-11-19 2000-02-08 Fonar Corporation MRI antenna
US6163717A (en) * 1998-11-25 2000-12-19 Toshiba America Mri, Inc. Open structure breast coil and support arrangement for interventional MRI
US6377836B1 (en) * 1999-02-17 2002-04-23 Toshiba America Mri, Inc. RF coil array for vertical field MRI
US6493572B1 (en) * 1999-09-30 2002-12-10 Toshiba America Mri, Inc. Inherently de-coupled sandwiched solenoidal array coil
FR2801427B1 (fr) * 1999-11-19 2001-12-21 Commissariat Energie Atomique Antenne quadripolaire utilisee dans un systeme rmn
US6668184B1 (en) * 2000-12-19 2003-12-23 Ge Medical Systems Global Technology Company, Llc System for and method of synchronizing an image data receiver and an MR imaging acquisition slice
US6850065B1 (en) 2001-07-27 2005-02-01 General Electric Company MRI coil system for breast imaging
DE10213565B3 (de) * 2002-03-26 2004-01-08 Siemens Ag Hochfrequenzantenne für eine Magnetresonanzanlage
WO2005024443A2 (fr) * 2003-09-04 2005-03-17 University Of Utah Research Foundation Reseaux de gradients de regions multiples pour champ etendu de vision en imagerie par resonance magnetique
ITSV20040015A1 (it) 2004-04-07 2004-07-07 Esaote Spa Dispositivo porta-paziente, come un lettino od un tavolo oppure una poltrona, e per macchine a risonanza magnetica nucleare, macchina a rosonanza magnetica nucleare e metodo per l'acquisizione di immagini in risonanza magnetica nucleare
GB2425610A (en) * 2005-04-29 2006-11-01 Univ London Magnetic properties sensing system
JP2009525073A (ja) * 2006-01-30 2009-07-09 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 乳房ｍｒの特異性を改善する方法及びワークフロー設計
JP4938492B2 (ja) * 2007-02-26 2012-05-23 株式会社日立製作所 Ｒｆコイル
US8731635B2 (en) * 2007-11-07 2014-05-20 University of Pittsburgh—of the Commonwealth System of Higher Education Coils for magnetic resonance spectroscopy and imaging of human breast
US8285361B2 (en) * 2007-11-14 2012-10-09 Hitachi Medical Systems America, Inc. Vertical field MRI breast coil
US9427186B2 (en) * 2009-12-04 2016-08-30 Endomagnetics Ltd. Magnetic probe apparatus
US10634741B2 (en) * 2009-12-04 2020-04-28 Endomagnetics Ltd. Magnetic probe apparatus
US9081067B2 (en) * 2011-05-09 2015-07-14 Imris Inc. Phased array MR RF coil which is not visible in X-ray image
EP2968560B1 (fr) 2013-03-11 2020-04-29 Endomagnetics Ltd. Solutions hypoosmotiques pour une détection de ganglion lymphatique
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Also Published As

Publication number Publication date
DE59307697D1 (de) 1998-01-02
US5416413A (en) 1995-05-16
EP0583824A3 (en) 1994-06-01
DE4226814A1 (de) 1994-02-17
JP3464024B2 (ja) 2003-11-05
EP0583824A2 (fr) 1994-02-23
JPH06181909A (ja) 1994-07-05

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